反应详情

To a solution of N-[6-chloro-4-(hydroxymethyl)pyridin-2-yl]-N-propylmethanesulfonamide (740 mg, 2.65 mmol) in dichloromethane (20 mL) cooled to 0° C. was added carbon tetrabromide (967 mg, 2.92 mmol) and triphenylphosphine (765 mg, 2.92 mmol). After 10 min, the reaction mixture was allowed to warm to rt and stirred for 0.5 h. The reaction mixture was concentrated in vacuo and purified by flash chromatography (silica, 0-25% EtOAc/hexanes) to provide N-[4-(bromomethyl)-6-chloropyridin-2-yl]-N-propylmethanesulfonamide as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.34 (s, 1H), 7.22 (s, 1H), 4.35 (s, 2H), 3.85 (t, J=7.6 Hz, 2H), 3.04 (s, 3H), 1.64-1.50 (m, 2H), 0.93 (t, J=7.2 Hz, 3H).

1. concentrationThe reaction mixture was concentrated in vacuo
2. custompurified by flash chromatography (silica, 0-25% EtOAc/hexanes)